Вычислите: √81 × 1,96; √21 × 15 × 35; √9 × 0,64; √49 × 2,25; √18 × 14 × 28; √15 × 10 × 6;

1)
$\sqrt{9 \times 9 \times1.4 {}^{2} } = 9 \times 1.4 = 12.6$
2)
$= \sqrt{7 \times 3 \times 5 \times 3 \times 5 \times 7} = 3 \times 5 \times 7 = 105$
3)
$= \sqrt{3 \times 3 \times 0.8 \times 0.8} = 3 \times 0.8 = 2.4$
4)=
$\sqrt{7 {}^{2} \times 1.5 {}^{2} } = 7 \times 1.5 = 10.5$
5)
$\sqrt{9 \times 2 \times 7 \times 2 \times 7 \times 4} = 3 \times 2 \times 7 \times 2 = 84$